If we try to use object.nextSibling to get the next list object of an unordered list, it is not always returning a list object. The following method can be use to get the next list object of an unordered list.
function getNextLi(the_li) {
var next_li = false;
if (the_li.nextSibling != null && the_li.nextSibling.nodeName == "LI") next_li = the_li.nextSibling;
return next_li;
}
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